AirHint found the following cheapest return flights from Lisbon (LIS) to Oslo (OSL) in September 2025 (see full year).

Return flights

25 Sep - 06 Oct	Ryanair
27 Sep - 06 Oct	KLM
27 Sep - 15 Oct	Norwegian
22 Sep - 01 Oct	Ryanair
25 Sep - 30 Sep	Vueling Airlines
17 Sep - 22 Sep	Ryanair
27 Sep - 06 Oct	TAP	direct
24 Sep - 11 Oct	Norwegian
28 Sep - 02 Oct	Ryanair
24 Sep - 13 Oct	Norwegian
24 Sep - 08 Oct	Norwegian
27 Sep - 11 Oct	Norwegian
18 Sep - 23 Sep	Vueling Airlines
20 Sep - 23 Sep	easyJet
21 Sep - 24 Sep	Ryanair
13 Sep - 21 Sep	KLM
06 Sep - 21 Sep	Norwegian
17 Sep - 19 Sep	easyJet
16 Sep - 18 Sep	Ryanair
09 Sep - 16 Sep	Ryanair

Also check the deals for one-way flights from Lisbon to Oslo in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Lisbon to Oslo in September from 166€

Return flights